Spinning cot



J. ROCKOFF Dec. 8, 1942.

SPINNING COT Filed Feb. 20, 1941 INVENTaQ JOSE/W ROOKOFF Br 47'7'0R/VEY6 MAW ' Patented Dec. 8, 1942 SPINNING co'r JoseplrRockofi, Dayton, Ohio, assignor to The Dayton Rubber Manufacturing Company, Dayton, Ohio, a corporation of Ohio' Application February 20, 1941, Serial No. 379,867

12 Claims.

This invention relates to textile spinning machines, and more particularly to cots for spinning and card room rolls. While this invention will be described in connection with the making of spinning roll cots, it will be appreciated that this invention is also adapted for forming other rolls,. such as temple rolls, loom take-up roll coverings, and the like, commonly used in a variety of textile working machines.

It is the principal object of this invention to make improved cots for spinning rolls which are resilient, possess good fiber drafting characteristics, exhibit low static build-up charge, are resistant to attack by oil and abrasive substances, and have good aging and wear resistant properties.

Another object is to devise a spinning roller or cot having the fiber working surface characteristics of leather, such as sheepskin and calfskin, and which is more resistant to wear and has substantially no tendency to cause the fiber to adhere to the surface of the rolls.

These and other objects and advantages will appear from the following description.

In the drawing:

Figure 1 is a perspective of a top spinning roller or cot with the covering partially broken away at one end;

Figure 2 is a section on the line 2-2 of Figure 1 looking in the direction of the arrows;

Figure 3 is a perspective of one end of the spinning cot sleeve; t v

Figure 4 is a section on the line 44 of Figure 3 looking in the direction of the arrows; and

Figure 5 is a section on the line 55 of Figure 3 looking in the direction of the arrows.

It has been the conventional practice heretofore to make spinning and fiber drawing roll cots of leather, cork and similar substances. Cots made of leather and cork are resistant to oil but they have very poor abrasive resistance and develop grooves, scored or uneven surface portions during use necessitating their removal 'for repair or replacement. Calkskin possesses the essential surface characteristics for working fibers 1 but it wears out rapidly due to its low resistance to abrasion. Attempts to substitute natural rubber compositions for making spinning rollers and cots have not proved successful chiefly because natural rubber is readily attacked by oil and tends to develop a gummy surface in use as a fiber working surface.

After extended research andexperimental testing of a large number of cots made of various compositions, and including large scale commercial tests conducted in textile mills, I have discovered that spinning roller cots made of synthetic rubber-like massescomprising butadiene co-polymers of acrylic nitriles when compounded with other ingredients and vulcanized produces a cot which can be ground to give a. fiber working surface possessing the characteristics of calfskin or the best leather covered cots. These cots have excellent fiber drafting properties exhibiting substantially no tendency of the fiber to stick or adhere to the surface of the rolls or to the units. Cots made according to my invention do not show'any tendency toward grooving, develop substantially no static charge, are

practically unaffected by oils and greases and do not eyebrow.

Among the essential properties desired in a spinning cot is that of being substantially static free and resistant to oils and greases. Synthetic rubbers, such as Neoprene and other similar butadiene polymers, such as methyl rubber, possess these essential properties but when using these materials in compounding cots, it was found that they were unsatisfactory because they would develop excessive eye brow and have a tendency to lap up the fiber being worked. 'I'hiokol has extremely nigh oil resistance. However, spinning cots made with this material also 'show the same defects of lapping and eye browing as Neoprene which is a polymer of 2- chlorobutadiene. Koroseal, a polyvinyl chloride synthetic rubber, is likewise resistant to oil and forms a smooth surface coat but this material develops the same defects as cots made of Neoprene and thiokol and therefore was discarded. Flexible glyptal resins also were found to be unsuited as they did notpossess the essential spinning characteristics "and exhibited the same tendency toward "lapping up and eye browing of the fiber as the other synthetic rubber materials.

In the drawing l is the acrylic nitrile copolymer cot and 2 indicates the core, such being composed usually of metal.

In view of the poor results obtained by the use of these synthetic rubber substances, it was un expected that the use of butadiene-acrylic nitrile coepolymers would not develop any of the defects of the aforementioned synthetic resin rubbers while possessing all of their advantageous properties, such as being oil resistant and having substantially no static build-up. I have discovered, however, that spinning cots compounded with butadiene-acrylic nitrileco-polymers produce ideal spinning cots which have proven by comtion for ulated according to this mercial tests that they are equal to calfskin in spinningi qualities and are much more durable.

A a t ical example of a spinning cot composiinvention, the

following is given:

Example .Parts by weight Butadiene acrylic nitrile co-polymer 80-125 Dibenzyl ether 10-25 Cumarone resin -12 Zinc oxide 4+8 Whiting 40-70 Sulfur f.. 1-2 Benzothiazyl' disulphide 0.9-1.5

These ingredients are compounded in the usual manner using suitable rubber mixing and compounding apparatus. After th materials are thoroughly incorporated they are molded and vulcanized to form a cot of the, desired shape.

In the above example, the butadiene-acrylic acid co-polymer compound may be used in different amounts, preferably on the order of from 30% to 55% by weight of the composition. The copolymer is vulcanized by heating with sulfur and the accelerator, similarly as in the case of natural rubber. The hardness of the cots is preferably within Shore type A durometer. Further, in order to modify the hardness of the final product and its resilience. addition of carbon black, zinc oxide, clays and the like may be made as required to produce a cot having the desired properties.

The improved results are obtained by compounding the ingredients with butadiene-acrylic nitrile co-polymer and vulcanizing or curing the product. Good results can be obtained by em-' ploying a great variety of fillers, accelerators and different resins,

get the improved results. While the'butadieneacrylic nitrile co-polymer has been found to be the most satisfactory, I do not preclude the use of other acrylic compounds. For example, the co-polymers of butadiene with acrylic acid esters or styrene may be employed.

I have discovered, after a large number of commercial tests, that the cots made from butadienearcylic nitrile co-polymer have a fiber working surface which is substantially equal to calfskin in spinning qualities. The cat surface is dry and possesses a smooth, velvety feel. Further, it does not develop a gumminess on prolonged running, and in addition to the improved surface characteristics of rolls made from cots compounded in accordance with my invention, the cots are tough, resilient, resistant against oxidizing and possess a very low static build-up. Aside from these improved characteristics of my spinning cots they possess excellent abrasive resistance and are highly resistant to attack by oil, and are greatly su perior to similar cots made with chloroprene and other known oil resistant synthetic rubber substances.

It will be appreciated that my rubber-like composition can be used in making a great variety of fiber working machine elements in textile machines, such as various kinds of rolls, covers, jackets, aprons and the like used in drafting, conveying and fiber working treatments and that the improved results and advantages can be obtained. Also it will be obvious that the degree of vulcanization or other curing treatment may be so controlled as to produce the desired physical property in the finished product. The proportionate 75' the range of 50 to 95 as measured on the:

: filler.

but it is essential twuseithe acrylic nitrile co-polymer of butadien in order to amount and substitution of different ingredients may be made in order to produce a product of the desired hardness, elasticity and frictional characteristics. In each instance the ingredients will be compounded with the butadlene and acrylic nitrile co-polymer and molded to the desired form or shape, vulcanized, and, if required, the surface ground, buffed, abraded, or otherwise machined to give it the desired surface characteristics.

It will be further understood that my invention is not limited to the specific example given but that various modifications and changes may be made and methods used in compounding my improved product by those skilled in the art without departing from the spirit and scope of my invention.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A textile machine unit for drafting fibers having a fiber contacting surface layer consisting of a vulcanized resilient composition including a vulcanizing agent such as sulphur comprising as an essential constituent a synthetic rubber composed of acrylic nitrile and butadiene co-polymer.

2. A textile machine unit for drafting fibers having a fiber contacting surface layer for contacting fibers consisting of a resilient composition including a vulcanizing agent such as sulphur comprising as an essential constituent a vulcanized synthetic rubber composed-of. butadiene-acrylic nitrile co-p01ymer admixed with 3. A textile machine having a fiber contacting surface layer for contacting fibers consisting of a resilient composition comprising as an essential constituent a synthetic rubber composed of butadiene-acrylic nitrile co-polymer which is compounded with filler and resinous ingredients and vulcanized to form a surface layer which is resistant to abrasion and having substantially no tendency to cause sticking of the fiber to the same.

4. A textile machine 'unit for drafting fibers having a fiber engaging member vulcanized with a vulcanizing agent and formed of a composition which has been polymerized containing butadiene-acrylic nitrile co- -polymer as an essential constituent, with whiting and cumarone' resin incorporated in suificient amounts to give a substantially static free friction resistant wearing surface.

5. A textile machine unit for drafting fibers having a fiber contacting element comprising a synthetic rubber composition composed of butadiene-acrylic nitrile co-polymer, filler, resin and sulfur, which has been vulcanized with a vulcanizing agent such as sulphur to produce a product having an oil. resistant, substantially static free fiber working surface.

6. A textile machine fiber contacting element comprising butadiene-acrylic nitrile co-polymer compounded with substances serving to provide the required hardness and wearing qualities which has been vulcanized with sulphur, said fiber working element being substantially static free under ordinary working conditions.

7. A textile machine fiber contacting element provided with a cot composed of a vulcanized elastic composition comprising butadiene-acrylic I unit for drafting fibers which is substantially provided-with a cot composed of a polymerized elastic composition comprising butadien'e-acrylic nitrile co-polymer, resin, dibenzyl ether, zinc oxide and whiting admixed together and vulcanized with a vulcanizing agent to a relatively hard resilient body of uniform density which is wear resistant and is substantially free from a tendency to cause the fiber on which it is used to adhere to it under the usual working conditions.

9. A textile machine fiber contacting element provided with a surface layer formed of an elastic composition comprising as a principal ingredient synthetic rubber selected from the group consisting of the co-polymers of butadiene-acrylic acid esters and acrylic nitrile, said synthetic rubber being compounded with addition agents .and vulcanized with sulphur to provide a relatively hard, resilient body of uniform density and having substantially no tendency to build up a static charge to cause adherence of the fiber under normal working conditions.

10. A textile machine fiber contacting roll mechanism having a covering cot composed of an elastic vulcanized composition which has been first polymerized, comprising :35 a principal constituent a co-poLvmer of butadiene and acrylic nitrile plus a ,vulcanizing agent, said co-polymer being compounded with fillers and other ingredients to. increase its hardness and wearing properties and provide a fiber-working surface substantially equal to calfskin and having no tendency to develop a static charge.

11. As an article of manufacture for use in textile spinning machine units, a,,cot formed of, a 1

resilient body which has been polymerized, comprising as an essential constituent butadieneacrylic nitrile co-polymer, which has been vulcanized with a vulcanizing agent such as sulphur. 12. As an article of manufacture for use in textile spinning machines, a cot formed of butadie'ne-acrylic nitrile co-polymerand sulfur and vulcanized therewith. I

JOSEPH ROCKOFF.

Disclaimer Ohio. SPINNING O01. Patent dated Dec. 8,

'2,804,656.-J0seph Rockojf, Dayton,

4, 1949, by the inventor and the assignee,

1942. Disclaimer filed Jan. The Dayton Rubber Company. Hereby enter this disclaimer of claims 1 to 6, in Patent No. 2,304,656.

This disclaimer supersedes 1949.

elusive, and 9 of said Letters disclaimer published in Official Gazette February 8,

[Ofiicial Gazette April 5, 1949.] 

